PCI: cache PCIe capability offset

There are a lot of codes that searches PCI express capability offset
in the PCI configuration space using pci_find_capability(). Caching it
in the struct pci_dev will reduce unncecessary search. This patch adds
an additional 'pcie_cap' fields into struct pci_dev, which is
initialized at pci device scan time (in set_pcie_port_type()).

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 623086f9ba84..54b9f1501487 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -692,6 +692,7 @@ static void set_pcie_port_type(struct pci_dev *pdev)
         if (!pos)
                 return;
         pdev->is_pcie = 1;
+        pdev->pcie_cap = pos;
         pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
         pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
 }